no-useless-escape

禁止不必要的转义字符

✅

在 配置文件 中使用来自 @eslint/js 的 recommended 配置可以启用此规则

💡

此规则报告的一些问题可通过编辑器 建议 手动修复

转义字符串、模板字面和正则表达式中的非特殊字符没有任何效果，如下例所示：

¥Escaping non-special characters in strings, template literals, and regular expressions doesn’t have any effect, as demonstrated in the following example:

let foo = "hol\a"; // > foo = "hola"
let bar = `${foo}\!`; // > bar = "hola!"
let baz = /\:/ // same functionality with /:/

规则详情

¥Rule Details

此规则标记可以在不改变行为的情况下安全删除的转义。

¥This rule flags escapes that can be safely removed without changing behavior.

此规则的错误代码示例：

¥Examples of incorrect code for this rule:

在线运行 
/*eslint no-useless-escape: "error"*/

"\'";
'\"';
"\#";
"\e";
`\"`;
`\"${foo}\"`;
`\#{foo}`;
/\!/;
/\@/;
/[\[]/;
/[a-z\-]/;

此规则的正确代码示例：

¥Examples of correct code for this rule:

在线运行 
/*eslint no-useless-escape: "error"*/

"\"";
'\'';
"\x12";
"\u00a9";
"\371";
"xs\u2111";
`\``;
`\${${foo}}`;
`$\{${foo}}`;
/\\/g;
/\t/g;
/\w\$\*\^\./;
/[[]/;
/[\]]/;
/[a-z-]/;

选项

¥Options

此规则有一个对象选项：

¥This rule has an object option:

  • allowRegexCharacters - 正则表达式中允许包含不必要转义字符的字符数组。这对于像 - 这样的字符非常有用，因为转义可以防止意外的字符范围。例如，在 /[0\-]/ 中，转义符在技术上是不必要的，但有助于防止模式在稍后添加其他字符时变成范围（例如，/[0\-9]/ 与 /[0-9]/）。

    ¥allowRegexCharacters - An array of characters that should be allowed to have unnecessary escapes in regular expressions. This is useful for characters like - where escaping can prevent accidental character ranges. For example, in /[0\-]/, the escape is technically unnecessary but helps prevent the pattern from becoming a range if another character is added later (e.g., /[0\-9]/ vs /[0-9]/).

allowRegexCharacters

{ "allowRegexCharacters": ["-"] } 选项的错误代码示例：

¥Examples of incorrect code for the { "allowRegexCharacters": ["-"] } option:

在线运行 
/*eslint no-useless-escape: ["error", { "allowRegexCharacters": ["-"] }]*/

/\!/;
/\@/;
/[a-z\^]/;

{ "allowRegexCharacters": ["-"] } 选项的正确代码示例：

¥Examples of correct code for the { "allowRegexCharacters": ["-"] } option:

在线运行 
/*eslint no-useless-escape: ["error", { "allowRegexCharacters": ["-"] }]*/

/[0\-]/;
/[\-9]/;
/a\-b/;

何时不使用

¥When Not To Use It

如果你不想收到有关不必要转义的通知，你可以安全地禁用此规则。

¥If you don’t want to be notified about unnecessary escapes, you can safely disable this rule.

版本

此规则是在 ESLint v2.5.0 中引入。

资源